/*
 *  Simbad - Robot Simulator
 *  Copyright (C) 2004 Louis Hugues
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful, 
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 -----------------------------------------------------------------------------
 * $Author: sioulseuguh $ 
 * $Date: 2005/03/17 17:49:37 $
 * $Revision: 1.6 $
 * $Source: /cvsroot/simbad/src/simbad/sim/FrameMeter.java,v $
 */

package simbad.sim;

/* A helper class to measure the frame per second at a given point. */
final class FrameMeter {

	private long lastTime;
	private long startTime;
	private long count;
	private long totalCount;
	/** Instant fps */
	public float fps;
	public float fpsSinceStart;
	private int updateRate;

	public FrameMeter() {
		updateRate = 200;
		reset();
	}

	/*
	 * Method to be called at the measure point
	 * 
	 */
	public void measurePoint(int inc) {
		count += inc;
		totalCount += inc;
		if (count >= updateRate) {
			long currTime = System.currentTimeMillis();
			long dt = (currTime - lastTime);
			if (dt != 0)
				fps = (1000f * count) / dt;
			fpsSinceStart = (1000f * totalCount) / (currTime - startTime);
			lastTime = currTime;
			count = 0;
		}
	}

	public int getUpdateRate() {
		return updateRate;
	}

	public void setUpdateRate(int rate) {
		updateRate = rate;
		reset();
	}

	/* Resets the measure */
	public void reset() {
		startTime = lastTime = System.currentTimeMillis();
		totalCount = 0;
		count = 0;
		fps = 0;
		fpsSinceStart = 0;
	}
}